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conformance · v142

v142 · mobile-and-desktop-parity-for-select-element-rendering-modes — conformance probe

6 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.

browser: spec: https://html.spec.whatwg.org/multipage/form-elements.html#the-select-element chromestatus: #5412736871825408 generated 2026-06-01T08:13:10Z by conformance-author-v1-subagent
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id contract kind verdict detail
select-element-exists HTMLSelectElement is exposed; the rendering parity change touches its rendering, not its IDL surface. exists
select-size-attribute-reflects The size attribute reflects as a number; size > 1 is what triggers the in-page listbox rendering on every form factor now. script
select-multiple-attribute-reflects The multiple attribute reflects as a boolean; multiple (with no size) now also triggers in-page rendering uniformly. script
select-multiple-size-1-still-allowed multiple with size=1 is allowed; the new behaviour is to render this as a popup on every form factor. script
select-selectedoptions-collection HTMLSelectElement exposes selectedOptions; this is the IDL surface a multi-select listbox surfaces user selection through. script
option-element-still-exposed HTMLOptionElement is exposed; the rendering change does not alter the option IDL. exists